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shipping on the mind of mississippi river -- mighty mississippi river as water levels reached new lows. >> representative -- rice has been growing in this part of southeast texas for centuries. it is water intensive, and the field has to be irrigated using water from local rivers and lakes, but the drought of recent years has been threatening the farmer's livelihood. >> we have not had water for the lakes, and when they are at a certain level, they will not allow us to get water or the producers to the water because the lakes are so low. >> local authorities have tried to ease the situation by rationing water, but with so little rain, the largest cities in the region may soon be left high and dry as well. no official figures show farmers in north america can expect more hot, dry weather in years to come. 2012 was the hottest year since records began over a century ago. scientists say that is a clear indication that the region's climate is changing. it is not just farm owners, but also many farm workers who face an uncertain future as the world's weather patterns change. >> if we do not
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